cheetsheets

gistfile1.txt

some

rexml:

open file:

Element:
each_element( xpath=nil ) {|Element| ...}
each_element_with_attribute( key, value=nil, max=0, name=nil ) {|Element| ...}
each_element_with_text( text=nil, max=0, name=nil ) {|Element| ...}
get_elements( xpath )
get_text(path = nil)
text( path = nil )

XPath:
each
first
match

Elements:
find element - []

ruby text processing:

lib strscan

String

tr (str, str)

insert

strip - delete ' '

start_with?

squeeze - sub 2 chars

delete, #count - chars

concat - obj, int

chop, #chomp

test - file

gets - file ARGV

tap {} - return self

ascii_only?

id

sub - replacement, search

slice - search

scanf - scans string

block_scanf -

scan - matching

index - find first occurence

next

match

include

gsub

[] - search

[]= replace

lines - to_a

each_line

each_codepoint - char2integer

each_char

each_byte

chars

codepoints

bytes - set bytes

split

rpartition - split on parts

prepend

clear

select - interested example with state

scrub - replace code chars

ord

intern - to sym

codepoints

rjust, #ljust - format tab output

printf

pretty_inspect

p

format

center

eql?

equal?

File#pathmap

open

gets

ext

idioms:

loop do
print "Input: "
line = gets
break if !line or line =~ /^qQ/
# ...
end

select - interested example with state

ruby MAIN FLOW:

def do_at_exit(str1)
at_exit { print str1 }
end
at_exit { puts "cruel world" }
do_at_exit("goodbye ")
exit

File:

Dir

entries

foreach dir

FileUtils

copy_entry

copy_file

copy_stream

cp, copy

CLI Options:

http://ruby-doc.org/stdlib-2.2.0/libdoc/getoptlong/rdoc/GetoptLong.html
The GetoptLong class allows you to parse command line options similarly to the GNU getopt_long() C library call.

http://ruby-doc.org/stdlib-2.2.0/libdoc/optparse/rdoc/OptParse.html
OptionParser is a class for command-line option analysis. It is much more advanced, yet also easier to use, than GetoptLong, and is a more Ruby-oriented solution.

https://github.com/leejarvis/slop